Question: A batch of moisture-bearing solid is processed in a tray dryer at constant drying conditions. The thickness of the material on the tray is 25.4

A batch of moisture-bearing solid is processed in a tray dryer at constant drying conditions. The thickness of the material on the tray is 25.4 mm and only the top surface is exposed to drying. The drying rate during the constant rate period is 2.05 kg H2O/hm2 . A ratio of 24.4 kg dry solid/m2 exposed surface is used. The initial free moisture is X1 = 0.55 and the critical moisture content Xc= 0.22 kg free moisture/kg dry solid. Determine the time to dry a batch of this material from X1=0.45 to X2=0.30, at the same drying conditions, but now at a thickness of 50.8 mm with drying for the top and bottom surfaces. Consider first estimating the new value of kg dry solid/m2 exposed surface for these new conditions.

a) Kg dry solid/m2 exposed surface.

b) Time to dry the top and bottom surfaces in hours.

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